feat: add Docker support, refactor DB layer, update API responses

bin/database/database_provider.dart

@@ -18,11 +18,11 @@ class DatabaseProvider {
   Future<void> initialize() async {
     final dotenv = DotEnv();
 
-    final host = dotenv['POSTGRES_HOST'] ?? 'localhost';
+    final host = dotenv['POSTGRES_HOST'] ?? 'db';
     final port = int.parse(dotenv['POSTGRES_PORT'] ?? '5432');
     final databaseName = dotenv['POSTGRES_DB'] ?? 'family_safety';
     final username = dotenv['POSTGRES_USER'] ?? 'postgres';
-    final password = dotenv['POSTGRES_PASSWORD'] ?? '';
+    final password = dotenv['POSTGRES_PASSWORD'] ?? 'postgres';
 
     try {
       final defaultConnection = await Connection.open(
@@ -43,8 +43,7 @@ class DatabaseProvider {
 
       if (results.isEmpty) {
         await defaultConnection.execute(
-          Sql.named('CREATE DATABASE @dbName'),
-          parameters: {'dbName': databaseName},
+          Sql('CREATE DATABASE $databaseName'),
         );
         print('Database $databaseName created.');
       } else {
@@ -78,7 +77,7 @@ class DatabaseProvider {
       await _dbConnection.execute(
         Sql.named('''
         CREATE TABLE IF NOT EXISTS geopositions (
-          id SERIAL PRIMARY KEY,
+          id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
           x_value DOUBLE PRECISION NOT NULL,
           y_value DOUBLE PRECISION NOT NULL,
           last_update TIMESTAMP NOT NULL DEFAULT NOW(),
@@ -265,7 +264,7 @@ class DatabaseProvider {
   Future<Geoposition?> getLatestPosition() async {
     final results = await _dbConnection.execute(
       Sql.named('''
-      SELECT id, x_value, y_value, last_update, expires_at
+      SELECT x_value, y_value, last_update, expires_at
       FROM geopositions
       WHERE expires_at > NOW()
       ORDER BY last_update DESC